Hair Loss from Mounjaro and Wegovy: What's Going On and What You Can Do

Hair shedding during weight loss is a well-recognised phenomenon. When the body loses weight relatively quickly, the physical and nutritional stress can push a larger-than-usual proportion of hair follicles into a resting (telogen) phase at the same time. Around two to four months later, those follicles shed their hairs together — which is why the timing can feel disconnected from when you started the medicine. This pattern is commonly reported by people on both tirzepatide (Mounjaro) and semaglutide (Wegovy).

Is the medicine itself causing it?

Current evidence points to rapid calorie reduction and weight change as the primary driver, rather than a direct pharmacological effect of the medicine. That said, if you are concerned about hair changes you are experiencing, it is always worth raising with your prescriber or doctor — they can rule out other causes such as nutritional deficiencies or thyroid changes, which are worth checking.

Nutrition may play a role

When appetite is significantly reduced, it can become harder to hit adequate protein and micronutrient intake. Some people find that prioritising protein-rich foods during their GLP-1 journey helps support hair health, though individual needs vary. For a deeper look at the evidence and experience around this, hair loss and weight loss is worth reading alongside this page.

You can also find more on managing this and other commonly reported effects on the Mounjaro side effects overview, which covers the broader picture of what people experience during treatment.

One of the most useful things you can do when you notice a side effect like hair shedding is to log it consistently over time. Spotting whether it started after a dose change, correlates with lower protein intake, or gradually improves week by week gives you something concrete to discuss with your prescriber — far more useful than a rough impression.

Log side effects and spot your own patterns

GLP Trackr's side-effect tracker lets you record how you are feeling day to day, including symptoms like hair shedding, fatigue, or changes in energy. Over time, the app surfaces patterns from your own data — so you can see whether things are improving, and when. That record also feeds directly into the doctor report feature, which pulls together a clear summary of your journey that you can bring to your next prescriber appointment.

If you want to look at whether nutrition might be a factor, the app's food logging — including AI photo scan and barcode entry — makes it straightforward to track your daily protein intake even when appetite is low. Seeing your protein trend alongside your side-effect log can be a genuinely illuminating combination.

For more detail on what people commonly experience and practical approaches, see hair loss on Mounjaro and how to manage hair loss on Mounjaro.

GLP Trackr is free to try — download it on the App Store or Google Play and start your 7-day trial to begin logging your symptoms and tracking your journey in one place.

If hair loss is severe, sudden, or accompanied by other worrying symptoms, contact your healthcare professional promptly. GLP Trackr helps you record what you are experiencing so you can discuss it with your prescriber — it is not a substitute for their advice, and any concerns about your health or medication should always be raised with them directly.